Ventilating fan



FIG. 1 is a perspective view,

FIG. 2 is a front face view,

FIG. 3 is side view,

FIG. 4 is a rear view,

FIG. 5 is a top plan view; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a ventilating fan, as shown and described. 